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 Title: |
US6301374:
Method for automatically checking the printing quality of a multicolor image
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Stringa, Luigi; Trento, Italy
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| Assignee: |
De La Rue Giori S. A., Lausanne, Switzerland
other patents from DE LA RUE GIORI S.A. (139935) (approx. 115)
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| Published / Filed: |
2001-10-09
/ 1997-03-17
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| Application Number: |
US1997000819421
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| IPC Code: |
Advanced:
B41F 33/00;
G01J 3/46;
G06K 9/64;
G06T 1/00;
G07D 7/00;
G07D 7/12;
G07D 7/20;
H04N 7/18;
Core:
more...
IPC-7:
G06K 9/00;
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| ECLA Code: |
B41F33/00D;
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| U.S. Class: |
Current:
382/112;
382/162;
Original:
382/112;
382/162;
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| Field of Search: |
382/112,162
356/402,404
358/504
250/559.44,559.39
385/109
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| Priority Number: |
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| Abstract: |
A sheet of paper (1) with the image to be checked passes in front of a camera (3) designed to capture three chromatic images and to emit three signals (S1, S2, S3). These signals are introduced into a device (4) applying a function F which comprises coefficients (K1, K2, K3, K10, K20, K30) previously recorded in a suitable device (2). The single signal (5) resulting from the function F is delivered to a device (6) for checking the printing quality.
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| Attorney, Agent or Firm: |
Bugnion S.A. ;
Moetteli, John ;
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| Primary / Asst. Examiners: |
Chang, Jon; Wu, Jingge
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| INPADOC Legal Status: |
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| Designated Country: |
AT CH DE FR GB IT LI SE
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| Family: |
Show 21 known family members
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First Claim:
Show all 13 claims |
What is claimed:
1. A method for automatically checking the printing quality of a multicolor image by means of at least one optoelectronic device enabling one color signal Si per chromatic channel to be obtained, wherein color signals Si0, obtained for the reference image or part of the same image are combined so as to obtain a single signal S, representative of all colors checked, which will be delivered to a device for automatically checking the printing quality for each image or art of the image with respect to a reference image or part of a reference image, the combination of said signals being a function F of he values of signals Si from each chromatic channel and of the value Si0 from a reference image or a corresponding part of a reference image, said function F being of the form: F(Si, Si0)=f(Ki log Si/Si0), i varying from 1 to n, n being the number of chromatic channels used by the checking apparatus, said function corresponding to an approximation of the human eye's response to differences in color, said function having the purpose of maximizing the detectability of differences between the checked image and the reference image.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 1 U.S. patent(s) that reference this one
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